<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var unm =10;
        console.log(num.tostring());//"10"
        console.log(num.tostring(2));//"1010"
        console.log(num.tostring(8));//"12"
        console.log(num.tostring(16));//"a"
    </script>
</body>
</html>